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The Terminator
Terminator Talk
I drastically dropped my fuel temps by over 100F
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<blockquote data-quote="MalcolmV8" data-source="post: 14357447" data-attributes="member: 8854"><p>Would love to hear a valid reason why? Of all the various return setups I ran the dead head held the most consistent pressure difference across injectors. As far as tuning the car, drivability, and performance I found ZERO differences between through rails and dead head rails. With the exception of massive heat differences.</p><p></p><p></p><p>This is partially true. You are correct -8 supply line is all you need however there is no side affect other than wasted money. You can't push to much fuel up. The return system is a closed circuit and you'll only flow as much fuel as the smallest restriction in your setup. So if you only had a -4 line returning back to the tank the entire system would be limited to that flow. Likely you'd have to much pressure and not be able to bleed it off though with such a small return line.</p><p></p><p></p><p></p><p>My experiences have proven otherwise. I've run multiple returnless setups over the years with various hats and pumps. I've done dual FPDMs with and without PPRV etc. I've also done multiple style return systems. The return style hands down is 100% hesitation free. No static pressure issues waiting for anything.</p><p></p><p></p><p></p><p>I wondered myself if there's even a performance issue at hand. Does cooler fuel burn better or anything? I really don't know, I don't think so which is why I never even mentioned it in the original post. As for retuning for such drastically different temp fuel that is very possible. I was retuning on each new configuration and layout anyways so I couldn't say for sure if just the temp drop alone was enough or if the ECU compensates for that on its own.</p><p></p><p></p><p></p><p>You were one of the people I recall exchanging messages with. As I recall your issue was even worse with the external pumps because you'd get vapor lock and be suck not even been able to fire up. I was at least lucky enough to have my pumps submerged in the boiling fuel lol.</p><p></p><p></p><p>A fuel cooler was my first thought when I discovered the issue and started exploring options. Instead I decided to find the source of the heat and try and eliminate that. Had I not gotten the fuel any cooler I would have definitely been installing one.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 14357447, member: 8854"] Would love to hear a valid reason why? Of all the various return setups I ran the dead head held the most consistent pressure difference across injectors. As far as tuning the car, drivability, and performance I found ZERO differences between through rails and dead head rails. With the exception of massive heat differences. This is partially true. You are correct -8 supply line is all you need however there is no side affect other than wasted money. You can't push to much fuel up. The return system is a closed circuit and you'll only flow as much fuel as the smallest restriction in your setup. So if you only had a -4 line returning back to the tank the entire system would be limited to that flow. Likely you'd have to much pressure and not be able to bleed it off though with such a small return line. My experiences have proven otherwise. I've run multiple returnless setups over the years with various hats and pumps. I've done dual FPDMs with and without PPRV etc. I've also done multiple style return systems. The return style hands down is 100% hesitation free. No static pressure issues waiting for anything. I wondered myself if there's even a performance issue at hand. Does cooler fuel burn better or anything? I really don't know, I don't think so which is why I never even mentioned it in the original post. As for retuning for such drastically different temp fuel that is very possible. I was retuning on each new configuration and layout anyways so I couldn't say for sure if just the temp drop alone was enough or if the ECU compensates for that on its own. You were one of the people I recall exchanging messages with. As I recall your issue was even worse with the external pumps because you'd get vapor lock and be suck not even been able to fire up. I was at least lucky enough to have my pumps submerged in the boiling fuel lol. A fuel cooler was my first thought when I discovered the issue and started exploring options. Instead I decided to find the source of the heat and try and eliminate that. Had I not gotten the fuel any cooler I would have definitely been installing one. [/QUOTE]
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I drastically dropped my fuel temps by over 100F
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